Since there were so many expositions held across the country, there is a huge array of these commemorative medals, so a comprehensive list would be daunting. Generally speaking, many are cheaply made; however, some have had real thought put behind the designs.

The major post-WW2 exposition was the 1970 Osaka Expo. Medals from this event are so plentiful that they can be said to be almost worthless. There are a few varieties that are harder to find, but they are not usually prized by collectors. When found, the prices are low. That being said, a very small number of .750 gold pieces were made, and of course these are valuable.